The main game scene¶
Now it's time to bring everything we did together into a playable game scene.
Create a new scene and add a Node named
Main. Ensure you
create a Node, not a Node2D. Click the "Instance" button and select your
Now, add the following nodes as children of
Main, and name them as shown
(values are in seconds):
MobTimer) - to control how often mobs spawn
ScoreTimer) - to increment the score every second
StartTimer) - to give a delay before starting
StartPosition) - to indicate the player's start position
Wait Time property of each of the
Timer nodes as follows:
In addition, set the
One Shot property of
StartTimer to "On" and set
Position of the
StartPosition node to
The Main node will be spawning new mobs, and we want them to appear at a random
location on the edge of the screen. Add a Path2D node
MobPath as a child of
Main. When you select
Path2D, you will
see some new buttons at the top of the editor:
Select the middle one ("Add Point") and draw the path by clicking to add the points at the corners shown. To have the points snap to the grid, make sure "Use Grid Snap" and "Use Snap" are both selected. These options can be found to the left of the "Lock" button, appearing as a magnet next to some dots and intersecting lines, respectively.
Draw the path in clockwise order, or your mobs will spawn pointing outwards instead of inwards!
After placing point
4 in the image, click the "Close Curve" button and your
curve will be complete.
Now that the path is defined, add a PathFollow2D
node as a child of
MobPath and name it
MobSpawnLocation. This node will
automatically rotate and follow the path as it moves, so we can use it to select
a random position and direction along the path.
Your scene should look like this:
Add a script to
Main. At the top of the script, we use
(PackedScene) to allow us to choose the Mob scene we want to instance.
Main node and you will see the
Mob property in the Inspector
under "Script Variables".
You can assign this property's value in two ways:
Mob.tscnfrom the "FileSystem" panel and drop it in the
Click the down arrow next to "[empty]" and choose "Load". Select
Next, select the
Player node in the Scene dock, and access the Node dock on
the sidebar. Make sure to have the Signals tab selected in the Node dock.
You should see a list of the signals for the
Player node. Find and
hit signal in the list (or right-click it and select
"Connect..."). This will open the signal connection dialog. We want to make a
new function named
game_over, which will handle what needs to happen when a
game ends. Type "game_over" in the "Receiver Method" box at the bottom of the
signal connection dialog and click "Connect". Add the following code to the new
function, as well as a
new_game function that will set everything up for a
Now connect the
timeout() signal of each of the Timer nodes (
ScoreTimer , and
MobTimer) to the main script.
StartTimer will start
the other two timers.
ScoreTimer will increment the score by 1.
_on_MobTimer_timeout(), we will create a mob instance, pick a random
starting location along the
Path2D, and set the mob in motion. The
PathFollow2D node will automatically rotate as it follows the path, so we
will use that to select the mob's direction as well as its position.
Note that a new instance must be added to the scene using
PI? In functions requiring angles, Godot uses radians,
not degrees. Pi represents a half turn in radians, about
3.1415 (there is also
TAU which is equal to
2 * PI).
If you're more comfortable working with degrees, you'll need to
rad2deg() functions to convert
between the two.
Testing the scene¶
Let's test the scene to make sure everything is working. Add this to
Let's also assign
Main as our "Main Scene" - the one that runs automatically
when the game launches. Press the "Play" button and select
You should be able to move the player around, see mobs spawning, and see the player disappear when hit by a mob.
When you're sure everything is working, remove the call to
What's our game lacking? Some user interface. In the next lesson, we'll add a title screen and display the player's score.